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<p>Fault structures critically govern stress redistribution and deformation-failure mechanisms in coal mine roadways, presenting substantial challenges to the safety and efficiency of deep coal mining. This study investigates the instability mechanisms and stabilization strategies for Roof Cutting and Roadway Maintenance (RCRM) influenced by fault activation and mining-induced stress coupling in Qipanjing Coal Mine (Eastern District), Inner Mongolia Autonomous Region, China. We adopted the methods of field investigation, theoretical analysis, and numerical simulation to conduct the research, and obtained the following key findings: Field monitoring shows that near fault zones, maximum roof-floor and rib deformations reach 404&#xa0;mm and 391&#xa0;mm, respectively, with deformations concentrated within 50&#xa0;m on both sides of faults. Theoretical analysis using a thin-plate model with mixed simply supported-fixed boundaries demonstrates that weakened boundary constraints (an increased proportion of simply supported boundaries) lead to a 3.57% rise in maximum roof deflection in fault-affected zones. Meanwhile, numerical simulations verify that roof-cutting techniques reduce the average vertical displacement difference above transportation and return airways by 15% and 26.84%, respectively, effectively suppressing fault stress transfer. Based on these results, a control technology integrating high-preload constant-resistance large-deformation anchor cable (CRAC) with optimized roof-cutting parameters is proposed. When the cutting height is increased to 10&#xa0;m and CRAC spacing is reduced to 1&#xa0;m, roof deformation decreases by 41%, the stabilization distance shortens by 11.1%, and the self-supporting capacity of surrounding rock is significantly enhanced. This study provides theoretical support and engineering case references for roadway stability control in fault-affected areas, and holds significant implications for green resource extraction in deep mining environments.</p>

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Deformation Mechanism and Control Technology of Retained Roadway in Qipanjing Coal Mine Under the Influence of Fault Structure

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Dongshan Yang,
  • Haohao Wang,
  • Xiaohui Kuai,
  • Shukun Zhang

摘要

Fault structures critically govern stress redistribution and deformation-failure mechanisms in coal mine roadways, presenting substantial challenges to the safety and efficiency of deep coal mining. This study investigates the instability mechanisms and stabilization strategies for Roof Cutting and Roadway Maintenance (RCRM) influenced by fault activation and mining-induced stress coupling in Qipanjing Coal Mine (Eastern District), Inner Mongolia Autonomous Region, China. We adopted the methods of field investigation, theoretical analysis, and numerical simulation to conduct the research, and obtained the following key findings: Field monitoring shows that near fault zones, maximum roof-floor and rib deformations reach 404 mm and 391 mm, respectively, with deformations concentrated within 50 m on both sides of faults. Theoretical analysis using a thin-plate model with mixed simply supported-fixed boundaries demonstrates that weakened boundary constraints (an increased proportion of simply supported boundaries) lead to a 3.57% rise in maximum roof deflection in fault-affected zones. Meanwhile, numerical simulations verify that roof-cutting techniques reduce the average vertical displacement difference above transportation and return airways by 15% and 26.84%, respectively, effectively suppressing fault stress transfer. Based on these results, a control technology integrating high-preload constant-resistance large-deformation anchor cable (CRAC) with optimized roof-cutting parameters is proposed. When the cutting height is increased to 10 m and CRAC spacing is reduced to 1 m, roof deformation decreases by 41%, the stabilization distance shortens by 11.1%, and the self-supporting capacity of surrounding rock is significantly enhanced. This study provides theoretical support and engineering case references for roadway stability control in fault-affected areas, and holds significant implications for green resource extraction in deep mining environments.